Plug



Patented July 7, 1931 v My n e q :z i ate w o ,impr wmsmtsg i ue nnwt xl p ugsizrand ha t d rmprq ar i ular y w t th qlas o Plug Whyh are adapted I qxhw s nneqw t eret 'QIi 9 5 mm.inafiwm ntaliti ii he. 19 .11 I f1my- VQIAtiQI spalitiwlwq y @daptd. f r use I1. ;Qnnmtie withtzvdi ir aiyin s t to which may: be iqqnnegteihead p n s t "f c nnegging them in the various oirquits yvh e re jaqk lalf lprqvid 2 911 9? r iarz p edfias. tov b @2 11)? ssem d..and@t th sametlme very du l able and str opg.

It iszxdesi ab ,atr ime (t .szdnnes m i z l l wQQQhQiiPh p sebum the connec plu s fiiahawhs nit m 9JnnQ@t.i al ,pl.u i isi Qrtid, into;.themri nsria-Q sm t h rmlnal'si 9f, the. mnn ptm terminal screw smi h fendrxqh d heacmd inoli il li let dislqdg n d 116m f '39 panyl'ng drawings in" Whicli Tikefifrrice fdhax galso pawmqsthe terminal 14 to insulate one from the other.

The conducting bolt 5 is provided with an enlarged portion 20 and the shoulder thus formed by the enlarged portion 20 registers with the face of the disk porton 15 of the terminal 14, and forms a conducting means between the tip contact 9 and its terminal 14. The tip contact 9 when threaded into position on the threaded end 7 of the bolt 5 draws the enlarged portion 20 against the disk portion 15 of the terminal 14, clamping the members 11, 17 and 14 in position. The rearwardly extending portion 25 of the terminal 11 is bifurcated as is also the rearwardly extending portion 26 of the terminal 14 for purposes as will presently be described. The bifurcated ends 25 and 26 of the terminals 11 and 14 are formed so as to bend inward, and an insulatin block 27 is provided with a central orifice o a size to receive the end 8 of the conducting bolt 7. The block 27 is provided with fiat faces 28 and 29, which respectively engage the bifurcated ends 25 and 26 of the terminals 11 and 14 when the block 27 is inserted between the said ends 25 and 26 to force them outward against their normal tension. The faces 28 and 29 of the block 27 are provided respectively with grooves 30 and 31, there being two grooves 30 in the face 28 in alignment withithe bifurcations 25' and 25 of theend 25 of the spring 11 and grooves 31 of which there are two in the face 29 of the block 7 are in alignment with the bifurcations 26 and 26 of the end 26 of the terminal 14. The block 27, which is positioned between the ends 25 and 26 of the terminals 11 and 14, is secured in position by means of a slotted nut 32 which has screw-threaded engagement with the threaded end 9 of the conducting bolt 5, the said nut 32 resting in a suitable orifice in the end of the block 27. A thin strip 40 of suitable insulation material is provided with an orifice 41 of a size to permit the insulation strip 40 to be slipped over the intermediate enlarged portion 20 of the bolt 5 and .when the same is in position it res'tsagainst the disk portion 15 of the terminal 14. The strip 40 is substantially rectan ular in shape and rests between the extended portions 25 and 26 of the terminals 11 and 14 with its sides 42 and 43 parallel with the extended portions 25 and 26 and in proximity thereto. The block 27 when positioned as just described by the nut 32 clamps the insulation strip 40 between its bottom face and the disk portion 15 of the terminal :14 and the sides 42 and 43 being parallel with the inner faces of the extended portions 25 and 26 of the respective terminals 11 and 14 will thus prevent the terminal 11 from rotating relative to the terminal 14. A form of cord tip that may be used is illustrated at 67 in Figure 3.

Now to insert the cord tips of the head phone set into engagement with the tip 11 and sleeve terminals 14, of the plug all that is necessary is to force the cord tips into the grooves 30 and 31 of the block 27 against the normal tension of the bifurcations 25 and 26 of the terminals 11 and 14. The tension of the bifurcations 25 and 26 are such as to hold the cord tips in the grooves 30 and 31 against displacement and insure a positive connection between the terminals 11 and 14 and the cord tips at all times. I provide a protective sleeve or handle 33 of suitable insulating material which has screwthreaded engagement with the threaded portion 2 of the plug, and serves as a cover or enclosing member for the plug and also as a handle for grasping the plug:- The handle 33 is also provided with a pair of orifices for the stay cords of the head set cords for purposes as will presently be described.

To relieve the strain from the cord should the plug be accidentally withdrawn by grasping the cord instead of the handle of the plug, a stay cord is put through the orifice 35 in the handle 33 of the plug and ties so as to allow slack in the individual conductors leading from the cord tips to the cord so that the cord tips will not be accidentally withdrawn from under the bifurcations 25 and 26 of the terminals 11 and 14.

To connect another head set to the plug, all that is necessary is to insert the cord tips of the second head set into the grooves 30 and 31 in the block 27 under the bifurcations 25 and 26 in which position the cord tips are connected to the terminals 11 and 14. It may be seen that it is a very simple matter to connect a head set to the plug of my invention without the usual trouble of loosening screws and holding the cord tips in position while the screw is again tightened, and especially so when trying to connect two head sets to the plug at the same time. The means of holding the cord tips in position in the plug of my invention is very advantageous over other plugs as the method of connectin the cord tips is very simple.

lVhile I have described a particular form of my invention it is to be understood that changes and modifications will readily suggest themselves to those skilled in the art and I therefore aim to cover all such changes and modifications as come within the spirit and scope of the appended claims.

WV hat I claim as new and desire tosecure py United States Letters Patent, is as folows:

1. A comiecting plug of the class described having a sleeve contact extension, a tip contact, a conducting bolt, spring terminals for said tip and sleeve contacts provided with rea-rwardly extendin bifurcated members, a block having a plurality of grooves in its faces and secured to said conducting bolt for separating said spring terminals, said conspring terminals in conductive relation with their respective tip and sleeve contacts, rearwardly extending bifurcated portions for said springs forming engaging means for multiple connections, and an insulating block secured to said conducting bolt and adapted to separate said spring terminals.

3. A connecting plug of the class described having a sleeve contact extension, a conducting bolt, a tip contact, spring terminals for said tip and sleeve contacts, rearwa-rdly extending bifurcated spring members integral- 1y formed with said terminals to form engaging means for multiple connection, a block composed of insulating material and having a plurality of grooves in its faces for separating said bifurcated spring members, said conducting bolt securing said tip contact, terminal springs and block to form a unitary structure. 7

4. A connecting plug of the class described having a sleeve contact extension, a tip contact, a conducting bolt for securing said tip contact to said sleeve extension, spring terminals for said tip'and sleeve contacts secured by said bolt in conductive relation respectively with said tip and sleeve contacts, rearwardly extending bifurcated members integrally formed with said spring terminals forming engaging means for multiple connections to said terminals and a block positioned by said bolt for separating said bifurcated members.

5. In a connecting plug of the class described having a sleeve contact, a tip contact,

a conducting bolt for securing said tip contact in association with said sleeve contact extension, spring terminals secured by said bolt in conductive relation respectively with said tip and sleeve contacts ablock having a plurality of grooves in its opposite faces, said block secured to said sleeve by means of said bolt, rearwardly extending bifurcated members for said spring terminals, said bifurcated members aligning with said grooves for receiving connections to said spring terminals.

6. A connecting plug of the character described including a-hollow sleeve member, a tip member, contact springs provided with rearwardly extending bifurcated members, a central bolt extending through said hollow sleeve securing said contact springs and tip member to said sleeve member, said bifur-- cated members forming engaging means for a plurality of connections, and an insulating block having a centrally located orifice arranged to fit over the said central bolt for preventing onejcontact spring from rotating relative to the other contact spring.

7. A connecting plug of the character described including a hollow sleeve member, a tip member, contact springs provided with rearwardly. extending bifurcated members,

said bifurcated members forming engaging means for multiple connections, a central bolt extending through said hollow sleeve securing said contact springs and tip member to said sleeve member, and an insulating block having a centrally located orifice arranged to fit over the said central bolt for preventing one contact spring from rotating relative to the other contact spring, and an insulating stud in between said contact springs.

8. A connecting plug of the character described including a hollow sleeve member, a tip member, contact springs, a central bolt extending through said hollow sleeve securing said contact springs and tip member to said sleeve member, and an insulating block having a centrally located orifice arranged to fit over the said central bolt for preventing one contact spring from rotating relative to the 7 other contact spring, and an insulating stud in between said contact springs, said insulating stud having grooves adapted to receive contact members.

i 9. A connecting plug of the character described including a hollow sleeve member, a

tip member, contact springs, a central bolt August, 1923. a I

WILLIAM KAI'SLING. 

